Assembled battery and manufacturing method thereof

摘要

A combined battery (100) comprising a plurality of flat-type cells (10A to 10F) by laminating thereof so that polarity of electrode tabs (11A to 11F and 12A to 12F) is alternately set, wherein welding parts to connect in series the flat cells themselves, to compose a set when all the flat-type cells (10A to 10F) are laminated, are separated at a plurality of positions of the combined battery, and the flat-type cells having such a structure that all the flat-type cells are electrically connected in series by welding each of the welding parts.

主权项

1. A combined battery, comprising:
first and second units, each including a plurality of flat-type cells, each flat-type cell having a positive electrode tab and a negative electrode tab, wherein the flat-type cells have two major surfaces and a thickness, wherein in each of the first and second units, the plurality of flat-type cells are laminated by stacking the flat-type cells in a lamination direction substantially perpendicular to the major surfaces and electrically connected to one another at a respective welding part that connects a positive electrode tab of a first flat-type cell to a negative electrode tab of a second flat-type cell, and portions of the positive electrode tab of the first flat-type cell and the negative electrode tab of the second flat-type cell that are electrically connected to one another by the welding part are offset from a negative electrode tab of the first flat-type cell, a positive electrode tab of the second flat-type cell, and a positive electrode tab and a negative electrode tab of every other flat-type cell in each unit when viewed down into the lamination direction, and wherein the first and second units are further electrically connected to one another in series with a unit welding part connecting a positive electrode tab of a flat-type cell in one of the first and second units and a negative electrode tab of a flat-type cell in the other of the first and second units, and portions of the positive electrode tab of the flat-type cell in the one of the first and second units and the negative electrode tab of the flat-type cell in the other of the first and second units that are electrically connected to one another by the unit welding part are offset from a negative electrode tab of the flat-type cell in the one of the first and second units, a positive electrode tab of the flat-type cell in the other of the first and second units, and a positive electrode tab and a negative electrode tab of every other flat-type cell in the first and second units, when viewed down into the lamination direction.